Fisheye lens for a screw mount leica or other screw mount rangefinder
While I realize there are very few people shooting a Leica, particularly a very old Leica such as a screw mount series, this is a fun project to repurpose a (censored) camera with a decent lens to a camera that I think is one of the best ever made.
Step 1: Prep
So you're not only going to need a Leica but also a Lomo Fisheye camera. You're going to need to remove the lens from the camera by taking it apart.